CN107090299A - A kind of liquid-crystal composition of substituted compound of polyfluoro containing methyl substituents and its application - Google Patents
A kind of liquid-crystal composition of substituted compound of polyfluoro containing methyl substituents and its application Download PDFInfo
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- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 75
- 239000000203 mixture Substances 0.000 title claims abstract description 39
- 150000001875 compounds Chemical class 0.000 title claims abstract description 32
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 title claims abstract description 7
- 229910052799 carbon Inorganic materials 0.000 claims description 76
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 74
- 125000000217 alkyl group Chemical group 0.000 claims description 20
- 229910052731 fluorine Inorganic materials 0.000 claims description 20
- 125000003545 alkoxy group Chemical group 0.000 claims description 17
- 229910052739 hydrogen Inorganic materials 0.000 claims description 16
- 125000003302 alkenyloxy group Chemical group 0.000 claims description 15
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 12
- 239000011737 fluorine Substances 0.000 claims description 12
- 239000001257 hydrogen Substances 0.000 claims description 12
- 125000003342 alkenyl group Chemical group 0.000 claims description 9
- 125000004435 hydrogen atom Chemical group [H]* 0.000 claims description 8
- 229910052801 chlorine Inorganic materials 0.000 claims description 4
- 125000001188 haloalkyl group Chemical group 0.000 claims description 4
- 125000002947 alkylene group Chemical group 0.000 claims description 3
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 claims 6
- 150000001336 alkenes Chemical class 0.000 claims 2
- 150000002118 epoxides Chemical class 0.000 claims 1
- 229910052736 halogen Inorganic materials 0.000 claims 1
- 150000002367 halogens Chemical class 0.000 claims 1
- 230000014759 maintenance of location Effects 0.000 abstract description 2
- 239000000126 substance Substances 0.000 abstract description 2
- 238000012360 testing method Methods 0.000 description 12
- 239000000463 material Substances 0.000 description 11
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 description 6
- 0 *c1cc(*)c(*)c(I)c1 Chemical compound *c1cc(*)c(*)c(I)c1 0.000 description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 3
- 230000004044 response Effects 0.000 description 3
- 239000002904 solvent Substances 0.000 description 3
- UWCWUCKPEYNDNV-LBPRGKRZSA-N 2,6-dimethyl-n-[[(2s)-pyrrolidin-2-yl]methyl]aniline Chemical compound CC1=CC=CC(C)=C1NC[C@H]1NCCC1 UWCWUCKPEYNDNV-LBPRGKRZSA-N 0.000 description 2
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 2
- HEDRZPFGACZZDS-UHFFFAOYSA-N Chloroform Chemical compound ClC(Cl)Cl HEDRZPFGACZZDS-UHFFFAOYSA-N 0.000 description 2
- 150000001721 carbon Chemical group 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- ZUOUZKKEUPVFJK-UHFFFAOYSA-N diphenyl Chemical compound C1=CC=CC=C1C1=CC=CC=C1 ZUOUZKKEUPVFJK-UHFFFAOYSA-N 0.000 description 2
- 239000012769 display material Substances 0.000 description 2
- 125000005291 haloalkenyloxy group Chemical group 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000001471 micro-filtration Methods 0.000 description 2
- 239000000178 monomer Substances 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- WOMWYTFHBFYIMC-UHFFFAOYSA-N CC1CC[I](C)CC1 Chemical compound CC1CC[I](C)CC1 WOMWYTFHBFYIMC-UHFFFAOYSA-N 0.000 description 1
- OTMSDBZUPAUEDD-UHFFFAOYSA-N Ethane Chemical compound CC OTMSDBZUPAUEDD-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000003044 adaptive effect Effects 0.000 description 1
- 150000001345 alkine derivatives Chemical class 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 125000001797 benzyl group Chemical group [H]C1=C([H])C([H])=C(C([H])=C1[H])C([H])([H])* 0.000 description 1
- 235000010290 biphenyl Nutrition 0.000 description 1
- 239000004305 biphenyl Substances 0.000 description 1
- 230000009514 concussion Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 125000000623 heterocyclic group Chemical group 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
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- C09K19/10—Non-steroidal liquid crystal compounds containing at least two non-condensed rings containing at least two benzene rings
- C09K19/12—Non-steroidal liquid crystal compounds containing at least two non-condensed rings containing at least two benzene rings at least two benzene rings directly linked, e.g. biphenyls
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- C09K19/30—Non-steroidal liquid crystal compounds containing at least two non-condensed rings containing saturated or unsaturated non-aromatic rings, e.g. cyclohexane rings
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- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
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- C09K19/3001—Cyclohexane rings
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Abstract
The present invention relates to a kind of liquid-crystal composition of the substituted compound of polyfluoro containing methyl substituents, including the compound represented by one or more formulas I：
Description
Technical field
The present invention relates to the liquid crystal of a kind of liquid-crystal composition, more particularly to a kind of polyfluoro containing methyl substituents substituted compound
Composition, belongs to liquid crystal display material technical field.
Background technology
Liquid crystal material is the key raw material for realizing liquid crystal display, in the world, the mixed liquor for TFT-LCD
Brilliant material is monopolized by German Merck companies and Chisso companies of Japan, be the characteristics of China's liquid crystal material industry TN (distort to
Row), STN (super twisted nematic) is relatively strong and TFT is very weak, liquid crystal monomer, intermediate are relatively strong and mixed liquid crystal is weaker.To downstream manufacturers
For, required for liquid crystal panel production is all mixed liquid crystal material, and TFT-LCD is also occupied already in field of liquid crystal
Leading position, therefore, the production domesticization of TFT mixed liquid crystals are the important steps that FPD industry improves domestic adaptive capacity for imported equipment.
Liquid crystal material passes through the development of more than 30 years, and 10,000 plurality of liquid crystals monomers have been synthesized at present, wherein conventional liquid crystal
Display material has thousands of kinds, is classified by the center bridged bond of liquid crystal molecule and the feature of ring, mainly there is biphenyl liquid crystal, benzyl ring
Hexane liquid crystal, ester liquid crystal, alkyne type liquid crystal, difluoromethoxy bridge liquid crystal, ethane and heterocyclic etc..
The liquid crystal material in TFT-LCD can be used except requiring that physical parameter matches with device, such as dielectric is each to different
Property, refractive anisotrop, elastic constant also requires high stability, including ultraviolet light stability, high-temperature stability and change in addition
Learn stability etc..There can be the liquid crystal material of high stability, polar group can only be the liquid crystal of F substitutions.Due to single liquid
Brilliant material can not possibly reach that various aspects of performance is all excellent, so exploitation mixed liquid crystal material, is mixed with the monocrystalline of different structure
After conjunction, reach that each side index is as excellent as possible.
The content of the invention
The present invention takes for deficiency present on existing single liquid crystal material property there is provided a kind of polyfluoro containing methyl substituents
Liquid-crystal composition and its application for compound.
The technical scheme that the present invention solves above-mentioned technical problem is as follows：
A kind of liquid-crystal composition of the substituted compound of polyfluoro containing methyl substituents, it is characterised in that including one or more
Compound represented by formula I：
Wherein, R represents that alkoxy or carbon number that alkyl, carbon number that carbon number is 1-7 are 1-6 are 2-6's
Institute's shape after one or more hydrogen are replaced by fluorine in the alkyl that alkenyloxy group that alkenyl, carbon number are 3-5, carbon number are 1-7
Into group, the group, the carbon number that are formed are after carbon number is replaced by one or more hydrogen in 1-6 alkoxy by fluorine
Any one in the group that one or more hydrogen are formed after being replaced by fluorine in 3-5 alkenyloxy group；
L1, L2, L3Respective independent expression H or F；
X0Represent that haloalkyl, carbon number that alkyl, carbon number that F, Cl, carbon number are 1-6 are 1-6 are 2-6
Alkylene, carbon number be 2-6 haloalkene alkyl, carbon number be 1-6 halogenated alkoxy or carbon number be 2-6's
Any one in halo alkenyloxy group；
One or more in independent expression following groups：
M represents 1,2.
Further, the structural formula of the compound with formula I is as follows：
Further, in addition to the compound as represented by formula II~IV：
In formula II-IV, R1-R4Alkyl that each independent expression hydrogen atom, carbon number are 1-7, carbon number are 1-
In the alkyl that alkenyloxy group that alkenyl that 6 alkoxy or carbon number is 2-6, carbon number are 3-5, carbon number are 1-7
Group that one or more hydrogen are formed after being replaced by fluorine, carbon number are taken for one or more hydrogen in 1-6 alkoxy by fluorine
In the group that group, the carbon number formed after generation is formed after being replaced by one or more hydrogen in 3-5 alkenyloxy group by fluorine
Any one；
L1-L9Respective independent expression H or F；
X1、X2Represent that haloalkyl, carbon number that alkyl, carbon number that F, Cl, carbon number are 1-6 are 1-6 are 1-
Haloalkene alkyl that alkylene that 6 halogenated alkoxy, carbon number are 2-6, carbon number are 2-6, carbon number are 2-6's
Any one in halo alkenyloxy group；
Respective any one or more independent represented in following group：
Z1Represent singly-bound ,-CH2-、-CH2-CH2- ,-CH=CH- ,-C ≡ C- ,-COO- ,-OOC- ,-CF2O-、-OCH2-、-
CH2O-、-OCF2-、-CF2CH2-、-CH2CF2-、-C2F4- in one kind；
A, b, c, d, e, f, g represent 0,1 or 2.
Further, the structural formula of compound with formula II is as follows：
Wherein, R1、R2The alkoxy that alkyl that independent expression H atom, carbon number are 1~7, carbon number are 1~6
Or carbon number be 2~6 alkenyl, carbon number be 3~5 alkenyloxy group in any one.
Further, the structural formula of compound with general formula III is as follows：
Wherein, R3Represent alkoxy or carbon atom that alkyl, carbon number that H atom, carbon number are 1~7 are 1~6
Any one in the alkenyloxy group that alkenyl that number is 2~6, carbon number are 3~5.
Further, the structural formula of compound with general formulae IV is as follows：
Wherein, R4Represent alkoxy or carbon atom that alkyl, carbon number that H atom, carbon number are 1~7 are 1~6
Any one in the alkenyloxy group that alkenyl that number is 2~6, carbon number are 3~5.
Further, fraction meter by weight, compounds contents of the one or more with formula I are 1~40%, a kind of or many
It is 1~70% to plant the compounds content with formula II, and compounds of the one or more with general formula III are 1~70%, a kind of
Or a variety of compounds with general formulae IV are 1~50%.
The beneficial effects of the invention are as follows：
The liquid-crystal composition that the present invention is obtained has the operating temperature of non-constant width, relatively low threshold voltage, high resistivity
And voltage retention, by force, good UV performances are ultraviolet front and rear all with high electric charge conservation rate, ion concentration for chemical stability
Change after ultraviolet light smaller.Therefore suitable for the TFT LCDs of TN, IPS, FFS isotype.
Electrooptics liquid crystal display and above-mentioned liquid-crystal composition containing above-mentioned liquid-crystal composition is also claimed in the present invention
In the application of field of liquid crystal display.
The liquid-crystal composition of the present invention can be produced two or more liquid-crystal compounds mixing using conventional method, such as
Mixing different component and method preparation soluble in one another at high temperature, wherein, liquid-crystal composition is dissolved in for the compound
Solvent in and mix, the solvent is then distilled out under reduced pressure；Or the liquid-crystal composition of the present invention can be according to conventional side
Prepared by method, such as the less component of wherein content is dissolved in the larger key component of content at a higher temperature, or will be each
Affiliated component dissolves in organic solvent, such as acetone, chloroform or methanol, is obtained after removing solvent after then solution is mixed.
Embodiment
The principle and feature of the present invention are described below in conjunction with example, the given examples are served only to explain the present invention, and
It is non-to be used to limit the scope of the present invention.
The liquid-crystal composition of gained is used first using the heat of solution or concussion mixed method that generally use in the industry in embodiment
Balance weighs liquid-crystal compounds by weight percentage, wherein addition sequence is weighed without particular requirement, it is generally molten with liquid-crystal compounds
The order of point from high to low weighs mixing successively, is shaken under 60 DEG C of constant temperature in heating stirring or earthquake machine so that each component melts
Solution is uniform, then produces target sample through absorption, the filter of micro-filtration membrane microfiltration, finally encapsulation.
Percentage in embodiment is weight percentage, and temperature is degree Celsius (DEG C).Such as illustrate without other, other symbols
Specific meaning and test condition are as follows：
Cp (DEG C) represents the clearing point of liquid crystal.
S-N represents the crystalline state of liquid crystal to nematic fusing point (DEG C).
△ n are optical anisotropy, and no is the refractive index of ordinary light, and ne is the refractive index of extraordinary ray, and test condition is,
589nm wavelength, 25 DEG C.Measuring instrument：Abbe refractometer
△ ε are dielectric anisotropy, △ ε=ε ∥-ε ⊥, wherein, ε ∥ are the dielectric constant parallel to molecular axis, and ε ⊥ are
Perpendicular to the dielectric constant of molecular axis, test condition is 25 DEG C；Measuring instrument：INSTEC:ALCT-IR1；20 microns of parallel boxes,
It is not added with chiral agent.
γ1：Rotary viscosity (mPas), test condition is 25 ± 0.2 DEG C.
Measuring instrument：INSTEC:ALCT-IR1；20 microns of parallel boxes, are not added with chiral agent.
Embodiment 1：
The formula of liquid-crystal composition is as follows：
The performance parameter test result of above-mentioned liquid-crystal composition is as follows：
| Project | S-N(℃) | Cp(℃) | △n | ne | △ε | ε⊥ | γ1 |
| Numerical value | ≤-40 | 88 | 0.110 | 1.598 | 5.0 | 3.3 | 63 |
Embodiment 2：
The formula of liquid-crystal composition is as follows：
The performance parameter test result of above-mentioned liquid-crystal composition is as follows：
| Project | S-N(℃) | Cp(℃) | △n | ne | △ε | ε⊥ | γ1 |
| Numerical value | ≤-30 | 100 | 0.110 | 1.586 | 7.6 | 3.4 | 105 |
Embodiment 3：
The formula of liquid-crystal composition is as follows：
The performance parameter test result of above-mentioned liquid-crystal composition is as follows：
| Project | S-N(℃) | Cp(℃) | △n | ne | △ε | ε⊥ | γ1 |
| Numerical value | ≤-40 | 93 | 0.117 | 1.598 | 8.5 | 3.6 | 70 |
Embodiment 4：
The performance parameter test result of above-mentioned liquid-crystal composition is as follows：
| Project | S-N(℃) | Cp(℃) | △n | ne | △ε | ε⊥ | γ1 |
| Numerical value | ≤-40 | 88 | 0.120 | 1.601 | 12.5 | 3.8 | 63 |
Embodiment 5：
The formula of liquid-crystal composition is as follows：
The performance parameter test result of above-mentioned liquid-crystal composition is as follows：
Embodiment 6：
The performance parameter test result of above-mentioned liquid-crystal composition is as follows：
| Project | S-N(℃) | Cp(℃) | △n | ne | △ε | ε⊥ | γ1 |
| Numerical value | ≤-40 | 96 | 0.101 | 1.599 | 8.9 | 3.5 | 78 |
Embodiment 7：
The performance parameter test result of above-mentioned liquid-crystal composition is as follows：
| Project | S-N(℃) | Cp(℃) | △n | ne | △ε | ε⊥ | γ1(mpa.s) |
| Numerical value | ≤-40 | 98 | 0.110 | 1.605 | 15.9 | 3.5 | 85 |
Embodiment 8：
The formula of liquid-crystal composition is as follows：
The performance parameter test result of above-mentioned liquid-crystal composition is as follows：
| Project | S-N(℃) | Cp(℃) | △n | ne | △ε | ε⊥ | γ1(mpa.s) |
| Numerical value | ≤-40 | 92 | 0.100 | 1.597 | 8.6 | 3.4 | 92 |
Liquid-crystal composition obtained by eight embodiments of the above, is respectively provided with good low-temperature stability, low rotary viscosity, low
Temperature area maintains the fast response time, can widen TN, the temperature in use of IPS or FFS liquid crystal modes, and ring with faster
Between seasonable and wider angular field of view, TN, IPS and FFS mode operation display are highly suitable for.
Liquid-crystal composition provided by the present invention has reduction threshold voltage and the effect of response time, therefore institute of the present invention
The liquid crystal media of offer be for preparing quick response, the preferable liquid crystal material of low rotary viscosity TFT LCD.
The foregoing is only presently preferred embodiments of the present invention, be not intended to limit the invention, it is all the present invention spirit and
Within principle, any modification, equivalent substitution and improvements made etc. should be included in the scope of the protection.
Claims (9)
1. a kind of liquid-crystal composition of the substituted compound of polyfluoro containing methyl substituents, it is characterised in that logical including one or more
Compound represented by formula I：
Wherein, R represents the alkene that alkoxy or carbon number that alkyl, carbon number that carbon number is 1-7 are 1-6 are 2-6
One or more hydrogen are formed after being replaced by fluorine in the alkyl that base, carbon number are 1-7 by 3-5 alkenyloxy group, carbon number
Group, the carbon number that group, carbon number are formed after being replaced by one or more hydrogen in 1-6 alkoxy by fluorine are 3-5
Alkenyloxy group in one or more hydrogen replaced by fluorine after any one in the group that is formed；
L1, L2, L3Respective independent expression H or F；
X0Represent the alkene that haloalkyl, carbon number that alkyl, carbon number that F, Cl, carbon number are 1-6 are 1-6 are 2-6
The haloalkene that the halogenated alkoxy or carbon number that haloalkene alkyl that base, carbon number are 2-6, carbon number are 1-6 are 2-6
Any one in epoxide；
One or more in independent expression following groups：
M represents 1,2.
2. liquid-crystal composition according to claim 1, it is characterised in that the structural formula of the compound with formula I
It is as follows：
3. liquid-crystal composition according to claim 1 or 2, it is characterised in that also including as represented by formula II~IV
Compound：
In formula II-IV, R1-R4Alkyl that each independent expression hydrogen atom, carbon number are 1-7, carbon number are 1-6's
One in the alkyl that alkenyloxy group that alkenyl that alkoxy or carbon number are 2-6, carbon number are 3-5, carbon number are 1-7
Or multiple hydrogen replaced by fluorine after formed group, carbon number for one or more hydrogen are replaced by fluorine in 1-6 alkoxy after
Appointing in the group that group, the carbon number formed is formed after being replaced by one or more hydrogen in 3-5 alkenyloxy group by fluorine
Meaning is a kind of；
L1-L9Respective independent expression H or F；
X1、X2Represent that haloalkyl, carbon number that alkyl, carbon number that F, Cl, carbon number are 1-6 are 1-6 are 1-6's
The halogen that haloalkene alkyl that alkylene that halogenated alkoxy, carbon number are 2-6, carbon number are 2-6, carbon number are 2-6
For any one in alkenyloxy group；
Respective any one or more independent represented in following group：
Z1Represent singly-bound ,-CH2-、-CH2-CH2- ,-CH=CH- ,-C ≡ C- ,-COO- ,-OOC- ,-CF2O-、-OCH2-、-
CH2O-、-OCF2-、-CF2CH2-、-CH2CF2-、-C2F4- in one kind；
A, b, c, d, e, f, g represent 0,1 or 2.
4. liquid-crystal composition according to claim 3, it is characterised in that the structural formula of compound with formula II is such as
Under：
Wherein, R1、R2Alkoxy or carbon that alkyl that independent expression H atom, carbon number are 1~7, carbon number are 1~6
Any one in the alkenyloxy group that alkenyl that atomicity is 2~6, carbon number are 3~5.
5. liquid-crystal composition according to claim 3, it is characterised in that the structural formula of compound with general formula III is such as
Under：
Wherein, R3Represent that alkoxy or carbon number that alkyl, carbon number that H atom, carbon number are 1~7 are 1~6 are 2
~6 alkenyl, carbon number are any one in 3~5 alkenyloxy group.
6. liquid-crystal composition according to claim 3, it is characterised in that the structural formula of compound with general formulae IV is such as
Under：
Wherein, R4Represent that alkoxy or carbon number that alkyl, carbon number that H atom, carbon number are 1~7 are 1~6 are 2
~6 alkenyl, carbon number are any one in 3~5 alkenyloxy group.
7. liquid-crystal composition according to claim 3, it is characterised in that fraction meter by weight, one or more have logical
The compounds content of formula I is 1~40%, and compounds content of the one or more with formula II is 1~70%, one or more
Compound with general formula III is 1~70%, and compound of the one or more with general formulae IV is 1~50%.
8. a kind of electrooptics liquid crystal display, it is characterised in that including the liquid crystal combination as any one of claim 1-7
Thing.
9. a kind of liquid-crystal composition any one of claim 1-7 is in the application of field of liquid crystal display.
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| CN109749755A (en) * | 2018-12-20 | 2019-05-14 | 西安近代化学研究所 | A kind of liquid-crystal compounds and composition improving liquid crystal material environmental suitability |
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